Improved Tele-Photography

Hydrocarbon Oils and their Value as Lubricants, with a Few Practical Tests

Production of Oxygen and Oxygen Light

Soluble Ferments

The Testing of Photographic Dry Plates

High Speed on Steam and Electric Railways

Production of Salt in 1904

Bacon and his Time

Diatoms, the Jewels of the Plant World

Discoveries at Ephesus

Experiments in Destroying Black-Flies

An Automatic Cask-Recording Machine

By The English Correspondent Of Scientific American

Submarine Signals

The First Producer-Gas Boat

Diamonds

Washing and Concentrating Machinery

Engineering Notes

Science Notes

Trade Notes and Recipes